FIELD
[0001] The present disclosure relates to a corner drive assembly for a window locking system,
such as may be included in a vent operator for a casement-style or a projection-style
window assembly.
BACKGROUND
[0002] This section provides background information related to the present disclosure which
is not necessarily prior art.
[0003] Vent operators, like that disclosed in International Patent Application Publication
No.
WO 2016/037186 A1 entitled "Vent Operator", are known to be employed in casement-style or projection-style
window assemblies. Vent operators may also include a locking system. The locking system
may include multiple lock points. For example, a window assembly may include lock
points at both the side and top of the window sash or frame. Vent operator locking
systems may also include one or more corner drive assemblies for transferring load
and motion around a corner of a window sash or frame. Thus, vent operator locking
systems can transfer movement of a horizontal lock bar through the corner drive assembly
and correspondingly move a vertical lock bar, or a vertical lock bar through the corner
drive assembly and correspondingly move a horizontal lock bar.
SUMMARY
[0004] This section provides a general summary of the disclosure, and is not a comprehensive
disclosure of its full scope or all of its features.
[0005] In one form, the present disclosure provides a corner drive assembly for a locking
system for a window. The corner drive assembly includes a case, a corner transfer
spring, a first arm, and a second arm. The case can be mounted to a window frame.
[0006] The case includes a first leg, a second leg, and a corner portion. The first leg
is substantially aligned with a first axis. The first leg includes a first interior
surface defining a first interior compartment. The second leg is substantially aligned
with a second axis perpendicular to the first axis. The second leg includes a second
interior surface defining a second interior compartment. The corner portion joins
the first leg and the second leg. The corner portion includes an outer relief surface
and a third interior compartment. The outer relief surface can be disposed adjacent
to a corner of the window frame and spaced apart from the window frame. The third
interior compartment is coextensive with the first and second interior compartments.
[0007] The corner transfer spring is at least partially slidably disposed in the third interior
compartment. The corner transfer spring has a first end and a second end. The first
end is slidable along the first axis. The second end is slidable along the second
axis.
[0008] The first arm is disposed in the first interior compartment. The first arm is slidable
along the first axis. The first arm is coupled to the first end of the corner transfer
spring. The second arm is disposed in the second interior compartment. The second
arm is slidable along the second axis. The second arm is coupled to the second end
of the corner transfer spring. The first and second arms can be coupled to respective
first and second link bars of the locking system.
[0009] In some embodiments, the first leg further includes a first outer surface. The first
outer surface can abut an inner surface of the window frame. The second leg further
includes a second outer surface. The second outer surface can abut the inner surface
of the window frame.
[0010] In some embodiments, the first leg also includes a first outer surface and a first
pair of opposing rails. The first pair of opposing rails is adjacent to and flush
with the first outer surface. The first pair of opposing rails is substantially parallel
with the first axis. The second leg further includes a second outer surface and a
second pair of opposing rails. The second pair of opposing rails is adjacent to and
flush with the second outer surface. The second pair of opposing rails is substantially
parallel to the second axis. The first pair of opposing rails and the second pair
of opposing rails can engage the window frame.
[0011] In some embodiments, the first interior compartment includes a first pair of opposing
channels. The first pair of opposing channels is substantially parallel to the first
axis. The second interior compartment includes a second pair of opposing channels.
The second pair of opposing channels is substantially parallel to the second axis.
The first arm can be slidably disposed within the first pair of opposing channels.
The second arm can be slidable disposed within the second pair of opposing channels.
[0012] In some embodiments, the first interior compartment further includes a first pair
of opposing grooves. The first pair of opposing grooves is substantially parallel
to the first axis. The second interior compartment further includes a second pair
of opposing grooves. The second pair of opposing grooves is substantially parallel
to the second axis. The first end of the corner transfer spring is slidably disposed
in the first pair of opposing grooves. The second end of the corner transfer spring
is slidably disposed in the second pair of opposing grooves.
[0013] In some embodiments, the corner drive assembly further includes a corner insert.
The corner insert is disposed within the third interior compartment. The corner insert
includes a curved passageway. The corner transfer spring is partially slidably disposed
within the curved passageway.
[0014] In some embodiments, the curved passageway includes a bearing surface. The bearing
surface has a first coefficient of friction. The case has a second coefficient of
friction. The first coefficient of friction is less than the second coefficient of
friction.
[0015] In another form, a corner drive assembly for a locking system of for window includes
a case, a corner insert, a corner transfer spring, a first arm, and a second arm.
The case can be mounted to a window frame. The case includes a first leg, a second
leg, and a corner portion. The first leg is substantially aligned with a first axis.
The first leg includes a first interior compartment. The second leg is substantially
aligned with a second axis. The second axis is perpendicular to the first axis. The
second leg includes a second interior compartment. The corner portion joins the first
leg and the second leg. The corner portion includes a third interior compartment.
The third interior compartment is coextensive with the first and second interior compartments.
The corner insert is disposed within the third interior compartment of the case. The
corner insert includes a curved passageway.
[0016] The corner transfer spring is slidably disposed in the curved passageway of the corner
insert. The corner transfer spring has a first end and a second end. The first end
is movable long the first axis. The second end is movable along the second axis. The
first arm is disposed in the first interior compartment. The first arm is slidable
along the first axis. The first arm is coupled to the first end of the corner transfer
spring. The second end is coupled to the second end of the corner transfer spring.
The second arm is disposed in the second interior compartment. The second arm is slidable
along the second axis. The second arm is coupled to the second end of the corner transfer
spring. Motion of the first arm along the first axis causes corresponding motion of
the second arm along the second axis.
[0017] In some embodiments, the curved passageway includes a bearing surface. A first coefficient
of kinetic friction between the corner transfer spring and the bearing surface is
less than a second coefficient of kinetic friction between the corner transfer spring
and the case.
[0018] In some embodiments, the first coefficient of friction kinetic friction is less than
or equal to about 0.35.
[0019] In some embodiments, the corner insert includes a lubricant and a polymer including
acetal homopolymer (CH
2O)
n).
[0020] In some embodiments, the corner portion includes an outer relief surface. The outer
relief surface can be disposed adjacent to a corner of the window frame. The outer
relief surface can be spaced apart from the window frame.
[0021] In some embodiments, the first leg further includes a first outer surface. The first
outer surface can abut an inner surface of the window frame. The second leg further
includes a second outer surface. The second outer surface can abut the inner surface
of the window frame.
[0022] In some embodiments, the first leg further includes a first outer surface and a first
pair of opposing rails. The first pair of opposing rails is adjacent to and flush
with the first outer surface. The first pair of opposing rails is substantially parallel
with the first axis. The second leg further includes a second outer surface and a
second pair of opposing rails. The second pair of opposing rails is adjacent to and
flush with the second outer surface. The second pair of opposing rails is substantially
parallel to the second axis. The first pair of opposing rails and the second pair
of opposing rails can engage the window frame.
[0023] In yet another form, the present disclosure provides a corner drive assembly for
a locking system for a window. The corner drive assembly includes a case, a corner
transfer spring, a first arm, and a second arm. The case can be mounted to a window
frame.
[0024] The case includes a first leg, a second leg, and a corner portion. The first leg
is substantially aligned with a first axis. The first leg includes a first interior
compartment and a first mounting feature. The second leg is substantially aligned
with a second axis perpendicular to the first axis. The second leg includes a second
interior compartment and a second mounting feature. The corner portion joins the first
leg and the second leg. The corner portion includes a third interior compartment.
The third interior compartment is coextensive with the first and second interior compartments.
[0025] The corner transfer spring is slidably disposed in the third interior compartment.
The corner transfer spring has a first end and a second end. The first end is movable
along the first axis. The second end is movable along the second axis. The first arm
is disposed in the first interior compartment. The first arm is slidable with respect
to the first axis. The first arm is coupled to the first end of the corner transfer
spring. The first arm includes a first slot. The first slot is substantially aligned
with the first axis. The second arm is disposed in the second interior compartment.
The second arm is slidable with respect to the second axis. The second arm is coupled
to the second end of the corner transfer spring. The second arm includes a second
slot. The second slot is substantially aligned with the second axis. The first mounting
feature and the first slot are aligned and can receive a first fastener for fixing
the first leg of the case to the window frame. The second mounting feature and the
second slot are aligned and can receive a second fastener for fixing the second leg
of the case to the window frame. Motion of the first arm along the first axis causes
corresponding motion of the second arm along the second axis.
[0026] In some embodiments, the first and second arms have a length. The first and second
slots can slide a distance equal to the length within the first and second legs, respectively.
[0027] In some embodiments, the first leg includes a first pair of opposing side surfaces.
The first mounting feature is disposed equidistant between the side surfaces of the
first pair. The second leg includes a second pair of opposing side surfaces. The second
mounting feature is disposed equidistant between the side surfaces of the second pair.
[0028] In some embodiments, the corner portion includes an outer relief surface. The outer
relief surface can be disposed adjacent to a corner of the window frame. The outer
relief surface can be spaced apart from the window frame.
[0029] In some embodiments, the corner drive assembly further includes a corner insert.
The corner insert is disposed within the third interior compartment. The corner insert
includes a curved passageway. The curved passageway has a bearing surface. The corner
transfer spring is partially disposed within the curved passageway. The corner transfer
spring is slidable with respect to the curved passageway. The bearing surface has
a first coefficient of friction. The case has a second coefficient of friction. The
second coefficient of friction is less than the first coefficient of friction.
[0030] In some embodiments, the first leg further includes a first outer surface and a first
pair of opposing rails. The first pair of opposing rails is adjacent to and flush
with the first outer surface. The first pair of opposing rails is substantially parallel
with the first axis. The second leg further includes a second outer surface and a
second pair of opposing rails. The second pair of opposing rails is adjacent to and
flush with the second outer surface. The second pair of opposing rails is substantially
parallel to the second axis. The first pair of opposing rails and the second pair
of opposing rails can engage the window frame.
DRAWINGS
[0031] The drawings described herein are for illustrative purposes only of selected embodiments
and not all possible implementations, and are not intended to limit the scope of the
present disclosure.
FIG. 1 is a top perspective view of a corner drive assembly according to the principles
of the present disclosure;
FIG. 2 is a top perspective view of the corner drive assembly of FIG. 1 having a portion
of a case removed;
FIG. 3 is a partial cross-sectional view of the corner drive assembly of FIG. 1 taken
at line 4-4 of FIG. 1;
FIG. 4 is a partial bottom perspective view of a corner portion of the case of the
corner drive assembly of FIG. 1;
FIG. 5 is a cross-sectional view of the corner drive assembly of FIG. 1 taken at line
5-5 of FIG. 1; and
FIG. 6 is a partial perspective view of the corner drive assembly of FIG. 1 showing
a leg of the case and an arm.
[0032] Corresponding reference numerals indicate corresponding parts throughout the several
views of the drawings.
DETAILED DESCRIPTION
[0033] Example embodiments will now be described more fully with reference to the accompanying
drawings.
[0034] With reference to FIGS. 1 and 2, a corner drive assembly 10 for a locking system
of a vent operator for a window is provided. The corner drive assembly 10 may include
a case 12, a corner insert 14, a corner transfer spring 16, and first and second arms
18, 20. A window frame 22 (shown in FIG. 3) may include one or more corner drive assemblies
10. The corner drive assembly 10 may be mounted to the window frame 22 to transmit
horizontal motion to vertical motion or vertical motion to horizontal motion. For
example, an operator may move a handle to slide a lock bar horizontally, which in
turn causes a perpendicular lock bar to slide vertically (not shown).
[0035] The case 12 may include first and second legs 24, 26 connected by a corner portion
28. The corner portion 28 is disposed between the first and second legs 24, 26. The
first and second legs 24, 26 may be identical and perpendicularly oriented. More specifically,
the first leg 24 may be substantially aligned with a first axis 30 and the second
leg 26 may be substantially aligned with a second axis 32. The first axis 30 may be
substantially perpendicular to the second axis 32. By way of example, the first axis
30 may be parallel to a vertical window sash (not shown) and the second axis 32 may
be parallel to a horizontal window sash (not shown).
[0036] The case 12 may comprise one or more pieces. In one example, the case 12 may comprise
two halves 33 joined at a seam 34. In another example, the entire case 12 may be integrally
formed (not shown). In yet another example, each of the first and second legs 24,
26 may be a separate piece attached to the corner portion 28. The case 12 may comprise
glass-filled nylon, by way of non-limiting example.
[0037] Each leg 24, 26 may include an outer surface 36, an inner surface 38, and opposing
side surfaces 40. The side surfaces 40 may be substantially parallel to one another.
Each side surface 40 may be substantially perpendicular to the outer surface 36 and
the inner surface 38. The outer surface 36 may be sized and shaped to complement an
inner surface 42 of the window frame 22 (shown in FIG. 3).
[0038] Each leg 24, 26 may include a pair of opposing rails 44 adjacent to and flush with
the outer surface 36. The opposing rails 44 may extend from respective side surfaces
40. The opposing rails 44 may engage opposing rail grooves (not shown) in the window
frame 22 for positioning the corner drive assembly 10 within the window frame 22.
The opposing rails 44 may be integrally formed with the case 12 and flush with the
outer surface 36. The opposing rails 44 of the first leg 24 may be substantially parallel
with the first axis 30 and the opposing rails 44 of the second leg 26 may be substantially
parallel with the second axis 32.
[0039] Each leg 24, 26 may also include an interior surface 46 defining an interior compartment
48. Referring to FIG. 5, the interior compartment 48 may include a pair of opposing
channels 50. The opposing channels 50 of the first leg 24 may be substantially parallel
to the first axis 30 and the opposing channels 50 of the second leg 26 may be substantially
parallel with the second axis 32.
[0040] Returning to FIGS. 1 and 2, each leg 24, 26 may include a mounting feature 52. In
one example, the mounting feature 52 may include a first bore (not shown) extending
into the outer surface 36 and a second bore 56 that may be a counterbore extending
into the inner surface 38. In other non-limiting examples, the mounting feature 52
may include first and second threaded bores or first and second slots formed in respective
outer and inner surfaces (not shown). Each mounting feature 52 may receive a respective
fastener (not shown) to fix the case 12 to the window frame 22. The mounting feature
52 may be centered between the opposing side surfaces 40 of the case 12. Thus, the
mounting feature 52 may also be centered with respect to the window frame 22.
[0041] Referring to FIGS. 3 and 4, the corner portion 28 of the case 12 may be disposed
between the first leg 24 and the second leg 26 and join the first leg 24 to the second
leg 26. The corner portion 28 may include an outer relief surface 58. When the corner
drive assembly 10 is placed in the window frame 22, a gap 60 may be defined between
the outer relief surface 58 and an inside corner 62 of the window frame 22. Thus,
when the corner drive assembly 10 is installed on the window frame 22, there is an
open space 64 between the window frame 22 and the case 12 of the corner drive assembly
10. The open space 64 is particularly advantageous, for example, when adhesive or
silicone is present in the corner 62 of the window frame 22 because it allows the
first and second legs 24, 26 of the case 12 to be mounted flush with the inner surface
42 of the window frame 22 without interference by the corner portion 28 with the adhesive
or silicone.
[0042] The corner portion 28 may also include an interior surface 66 defining an interior
compartment 68 that is disposed between the respective interior compartments 48 of
the first leg 24 and the second leg 26 and coextensive with the interior compartments
48 of the first leg 24 and the second leg 26. The corner portion 28 may also include
an inner surface 70 opposite the outer relief surface 58. The inner surface 70 may
include an opening 72. In other examples, the interior compartment 68 of the corner
portion 28 may be fully enclosed such that the inner surface 70 is free of any openings
or holes (not shown).
[0043] As best shown in FIGS. 2 and 3, the corner insert 14 may be disposed within the interior
compartment 68 of the corner portion 28 of the case 12 and may occupy the entire interior
compartment 68. The corner insert 14 may include an exposed portion 74 at the opening
72 of the corner portion 28. The exposed portion 74 of the corner insert 14 may be
flush with the inner surface 70 of the corner portion 28 of the case 12. The corner
insert 14 may include a curved passageway 76 having a bearing surface 77.
[0044] The corner transfer spring 16 is slidable with respect to the case 12 and the corner
insert 14. The corner transfer spring 16 may be at least partially disposed within
the curved passageway 76 of the corner insert 14. The bearing surface 77 of the corner
insert 14 is directly adjacent to the corner transfer spring 16. Referring to FIG.
6, the corner transfer spring 16 may be partially disposed in respective pairs of
opposing grooves 78 in the first and second legs 24, 26 of the case 12. More specifically,
as shown in FIG. 4, a center section 80 of the corner transfer spring 16 is disposed
in the curved passageway 76 of the corner insert 14, a first end 82 of the corner
transfer spring 16 is disposed in the pair of opposing grooves 78 of the first leg
24 of the case 12, and a second end 84 of the corner transfer spring 16 is disposed
in the pair of opposing grooves 78 of the second leg of the case 12. The opposing
grooves 78 support the first and second ends 82, 84 of the corner transfer spring
16 and enable the corner transfer spring 16 to resist buckling under compressive loading.
[0045] The corner transfer spring 16 may be a thin strip of metal tape. In one example,
the corner transfer spring 16 is 0.0105 inches thick and 0.465 inches wide. The metal
tape may comprise steel or stainless steel, by way of non-limiting example.
[0046] The corner insert 14 may comprise plastic having low coefficients of static friction
and/or kinetic friction compared to the material of the case 12. The coefficient of
kinetic friction between the corner insert 14 and the corner transfer spring 16 may
be less than or equal to about 0.40, optionally less than or equal to about 0.35,
optionally less than or equal to about 0.30, optionally less than or equal to about
0.25, optionally less than or equal to about 0.20, optionally less than or equal to
about 0.15. Thus, the corner transfer spring 16 can freely slide along the bearing
surface 77 of the corner insert 14. The corner insert 14 may comprise an acetal or
polyoxymethylene (CH
2O)
n) plastic, such as an acetal homopolymer or a copolymer. Examples of acetal plastics
include Delrin®, Celcon®, Ramtal, Duracon®, Kepital®, and Hostaform®, by way of non-limiting
example. The corner transfer insert may further comprise a lubricant, such as polytetrafluoroethylene
("PTFE"). In one example, the corner insert 14 comprises acetal homopolymer and PTFE
at 12% by mass.
[0047] With reference to FIGS. 3 and 6, each of the first and second arms 18, 20 may include
a spring end 86 and a lock end 88. The spring end 86 of the first arm 18 is connected
to the first end 82 of the corner transfer spring 16 and the spring end 86 of the
second arm 20 is connected to the second end 84 of the corner transfer spring 16.
The first and second arms 18, 20 and first and second ends 82, 84 of the spring may
include respective fastening features, such as bosses 90 and holes 92. More specifically,
each end 82, 84 of the corner transfer spring 16 may include one or more holes 92.
The holes 92 may be sized to fit over one or more respective bosses 90 on an outer
surface 94 of each spring end 86 of the first and second arms 18, 20. The bosses 90
may be peened.
[0048] The lock end 88 of the first arm 18 may be connected to a first link bar of a locking
system (not shown). The lock end 88 of the second arm 20 may be connected to a second
link bar of the locking system (not shown). The lock end 88 of each of the first and
second arms 18, 20 may include a feature for attachment to the respective link bars.
For example, an inner surface 96 of the lock end 88 of each of the first and second
arms 18, 20 may include one or more bosses 98.
[0049] Each of the first and second arms 18, 20 may also include a respective slot 100 extending
between the outer surface 94 and the inner surface 96. The slots 100 may be used to
slidably connect the first and second arms 18, 20 to the first and second legs 24,
26 of the case 12, respectively, and the case 12 to the window frame 22. The slots
100 may be aligned with the mounting features 52 of the case 12 in a direction perpendicular
to the window frame 22. The slots 100 may have a length 102 in a direction parallel
to the first and second axes 30, 32.
[0050] The first and second arms 18, 20 are slidable along the first and second axes 30,
32, respectively, up to a distance equal to the length 102 of the slots 100. The slots
100 enable the case 12 to be mounted to the window frame independent of the position
of the first and second arms 18, 20. As shown by the position of the first arm 18
and first leg 24 of the case 12, there is clearance for a fastener to pass through
the mounting feature 52 and the slot 100 when the first arm 18 is fully extended.
Similarly, as shown by the position of the second arm 20 and the second leg 26 of
the case 12, there is clearance for a fastener to pass through the mounting feature
52 and the slot 100 when the second arm 20 is fully retracted. The first and second
arms 18, 20 may comprise zinc (e.g., Zamak 5) or cast steel, by way of non-limiting
example.
[0051] One of the first and second link bars may be connected to a handle (not shown) for
an operator to lock or unlock the window. When the operator actuates the handle, which
may be attached to a horizontal window sash, for example, the second or horizontal
lock bar is moved along the second axis 32. Motion of the second lock bar along the
second axis 32 causes motion of the second arm 20 along the second axis 32. The motion
of the second arm 20 along the second axis 32 is transferred through the corner transfer
spring 16 to the first arm 18. Motion of the first arm 18 along the first axis 30
causes motion of the first lock bar, which may lock or unlock the window.
[0052] Example embodiments are provided so that this disclosure will be thorough, and will
fully convey the scope to those who are skilled in the art. Numerous specific details
are set forth such as examples of specific components, devices, and methods, to provide
a thorough understanding of embodiments of the present disclosure. It will be apparent
to those skilled in the art that specific details need not be employed, that example
embodiments may be embodied in many different forms and that neither should be construed
to limit the scope of the disclosure. In some example embodiments, well-known processes,
well-known device structures, and well-known technologies are not described in detail.
[0053] The foregoing description of the embodiments has been provided for purposes of illustration
and description. It is not intended to be exhaustive or to limit the disclosure. Individual
elements or features of a particular embodiment are generally not limited to that
particular embodiment, but, where applicable, are interchangeable and can be used
in a selected embodiment, even if not specifically shown or described. The same may
also be varied in many ways. Such variations are not to be regarded as a departure
from the disclosure, and all such modifications are intended to be included within
the scope of the disclosure.
[0054] Additional embodiments and features of the present disclosure are presented below
as numbered clauses. Features of each of these embodiments may be combined with one
or more other embodiments from elsewhere in this disclosure, in any suitable manner.
Clause 1. A corner drive assembly for a locking system for a window comprising: a
case configured to be mounted to a window frame, the case comprising: a first leg
substantially aligned with a first axis and comprising a first interior surface defining
a first interior compartment; a second leg substantially aligned with a second axis
perpendicular to the first axis and comprising a second interior surface defining
a second interior compartment; and a corner portion joining the first leg and the
second leg, the corner portion comprising an outer relief surface configured to be
disposed adjacent to a corner of the window frame and a third interior compartment
coextensive with the first and second interior compartments, the outer relief surface
being configured to be spaced apart from the window frame; a corner transfer spring
at least partially slidably disposed in the third interior compartment and having
a first end slidable along the first axis and a second end slidable along the second
axis; a first arm disposed in the first interior compartment and slidable along the
first axis, the first arm being coupled to the first end of the corner transfer spring;
and a second arm disposed in the second interior compartment and slidable along the
second axis, the second arm being coupled to the second end of the corner transfer
spring, wherein the first and second arms are configured to be coupled to respective
first and second link bars of the locking system.
Clause 2. The corner drive assembly of clause 1, wherein: the first leg further comprises
a first outer surface configured to abut an inner surface of the window frame; and
the second leg further comprises a second outer surface configured to abut the inner
surface of the window frame.
Clause 3. The corner drive assembly of clause 1 or clause 2, wherein: the first leg
further comprises a first outer surface and a first pair of opposing rails adjacent
to and flush with the first outer surface, the first pair of opposing rails being
substantially parallel with the first axis; the second leg further comprises a second
outer surface and a second pair of opposing rails adjacent to and flush with the second
outer surface, the second pair of opposing rails being substantially parallel to the
second axis; and the first pair of opposing rails and the second pair of opposing
rails are configured to engage the window frame.
Clause 4. The corner drive assembly of any of clauses 1 to 3, wherein: the first interior
compartment includes a first pair of opposing channels substantially parallel to the
first axis; the second interior compartment includes a second pair of opposing channels
substantially parallel to the second axis; and the first arm is configured to be slidably
disposed within the first pair of opposing channels and the second arm is configured
to be slidably disposed within the second pair of opposing channels.
Clause 5. The corner drive assembly of any of clauses 1 to 4, wherein: the first interior
compartment further includes a first pair of opposing grooves substantially parallel
to the first axis; the second interior compartment further includes a second pair
of opposing grooves substantially parallel to the second axis; and the first end of
the corner transfer spring is slidably disposed in the first pair of opposing grooves
and the second end of the corner transfer spring is slidably disposed in the second
pair of opposing grooves.
Clause 6. The corner drive assembly of any of clauses 1 to 5, further comprising a
corner insert disposed within the third interior compartment, wherein the corner insert
includes a curved passageway and the corner transfer spring is partially slidably
disposed within the curved passageway.
Clause 7. The corner drive assembly of any of clauses 1 to 6, wherein: the curved
passageway includes a bearing surface having a first coefficient of friction; wherein
the case has a second coefficient of friction; and wherein the first coefficient of
friction is less than the second coefficient of friction.
Clause 8. A corner drive assembly for a locking system of a window comprising: a case
configured to be mounted to a window frame, the case comprising: a first leg substantially
aligned with a first axis and comprising a first interior compartment; a second leg
substantially aligned with a second axis perpendicular to the first axis and comprising
a second interior compartment; and a corner portion joining the first leg and the
second leg, the corner portion comprising a third interior compartment coextensive
with the first and second interior compartments; a corner insert disposed within the
third interior compartment of the case, the corner insert including a curved passageway;
a corner transfer spring slidably disposed in the curved passageway of the corner
insert and having a first end movable along the first axis and a second end movable
along the second axis; a first arm disposed in the first interior compartment and
slidable along the first axis, the first arm being coupled to the first end of the
corner transfer spring; and a second arm disposed in the second interior compartment
and slidable along the second axis, the second arm being coupled to the second end
of the corner transfer spring, wherein motion of the first arm along the first axis
causes corresponding motion of the second arm along the second axis.
Clause 9. The corner drive assembly of clause 8, wherein: the curved passageway includes
a bearing surface; and a first coefficient of kinetic friction between the corner
transfer spring and the bearing surface is less than a second coefficient of kinetic
friction between the corner transfer spring and the case.
Clause 10. The corner drive assembly of clause 9, wherein the first coefficient of
kinetic friction is less than or equal to about 0.35.
Clause 11. The corner drive assembly of any of clauses 8 to 10, wherein the corner
insert comprises a lubricant and a polymer comprising acetal homopolymer (CH2O)n).
Clause 12. The corner drive assembly of any of clauses 8 to 11, wherein the corner
portion includes an outer relief surface configured to be disposed adjacent to a corner
of the window frame, wherein the outer relief surface is configured to be spaced apart
from the window frame.
Clause 13. The corner drive assembly of any of clauses 8 to 12, wherein: the first
leg further comprises a first outer surface configured to abut an inner surface of
the window frame; and the second leg further comprises a second outer surface configured
to abut the inner surface of the window frame.
Clause 14. The corner drive assembly of any of clauses 8 to 13, wherein: the first
leg further comprises a first outer surface and a first pair of opposing rails adjacent
to and flush with the first outer surface, the first pair of opposing rails being
substantially parallel with the first axis; the second leg further comprises a second
outer surface and a second pair of opposing rails adjacent to and flush with the second
outer surface, the second pair of opposing rails being substantially parallel to the
second axis; and the first pair of opposing rails and the second pair of opposing
rails are configured to engage the window frame.
Clause 15. A corner drive assembly for a locking system of a window comprising: a
case configured to be mounted to a window frame, the case comprising: a first leg
substantially aligned with a first axis and comprising a first interior compartment
and a first mounting feature; a second leg substantially aligned with a second axis
perpendicular to the first axis and comprising a second interior compartment and a
second mounting feature; and a corner portion joining the first leg and the second
leg, the corner portion comprising a third interior compartment coextensive with the
first and second interior compartments; a corner transfer spring slidably disposed
in the third interior compartment and having a first end movable along the first axis
and a second end movable along the second axis; a first arm disposed in the first
interior compartment and slidable with respect to the first axis, the first arm being
coupled to the first end of the corner transfer spring and including a first slot
substantially aligned with the first axis; and a second arm disposed in the second
interior compartment and slidable with respect to the second axis, the second arm
being coupled to the second end of the corner transfer spring and including a second
slot substantially aligned with the second axis, wherein: the first mounting feature
and the first slot are aligned and configured to receive a first fastener for fixing
the first leg of the case to the window frame; the second mounting feature and the
second slot are aligned and configured to receive a second fastener for fixing the
second leg of the case to the window frame; and wherein motion of the first arm along
the first axis causes corresponding motion of the second arm along the second axis.
Clause 16. The corner drive assembly of clause 15, wherein the first and second slots
have a length and the first and second arms are configured to slide a distance equal
to the length within the first and second legs, respectively.
Clause 17. The corner drive assembly of clause 15 or clause 16, wherein: the first
leg includes a first pair of opposing side surfaces and the first mounting feature
is disposed equidistant between the side surfaces of the first pair; and the second
leg includes a second pair of opposing side surfaces and the second mounting feature
is disposed equidistant between the side surfaces of the second pair.
Clause 18. The corner drive assembly of any of clauses 15 to 17, wherein the corner
portion includes an outer relief surface configured to be disposed adjacent to a corner
of the window frame, wherein the outer relief surface is configured to be spaced apart
from the window frame.
Clause 19. The corner drive assembly of any of clauses 15 to 18, further comprising
a corner insert disposed within the third interior compartment, wherein: the corner
insert comprises a curved passageway having a bearing surface; the corner transfer
spring is partially disposed within the curved passageway and slidable with respect
to the curved passageway; and wherein the bearing surface has a first coefficient
of friction and the case has a second coefficient of friction, the second coefficient
of friction being less than the first coefficient of friction.
Clause 20. The corner drive assembly of any of clauses 15 to 19, wherein: the first
leg further comprises a first outer surface and a first pair of opposing rails adjacent
to and flush with the first outer surface, the first pair of opposing rails being
substantially parallel with the first axis; the second leg further comprises a second
outer surface and a second pair of opposing rails adjacent to and flush with the second
outer surface, the second pair of opposing rails being substantially parallel to the
second axis; and the first pair of opposing rails and the second pair of opposing
rails are configured to engage the window frame.